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Other Comprehensive Income - Changes in Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ (9,908) | $ 11,832 | $ (10,400)
Total other comprehensive income (loss), tax expense (benefit) | (2,523) | 4,393 | (4,031)
Other comprehensive (loss) income, net of tax | (7,385) | 7,439 | (6,369)
Unrealized holding losses on securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  | (3,617) | (10,119)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  | (1,399) | (3,913)
Other comprehensive income (loss), before reclassifications, net of tax |  | (2,218) | (6,206)
Unrealized holding gains on securities transferred from held to maturity to available for sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  | 13,219 |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  | 5,111 |
Other comprehensive income (loss), before reclassifications, net of tax |  | 8,108 |
Reclassification adjustment for gains realized in net income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  | (148) | (1,186)
Reclassification from AOCI, tax expense (benefit) |  | (57) | (459)
Reclassification from AOCI, net of tax |  | (91) | (727)
Amortization of unrealized holding gains on securities transferred to the held to maturity category |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  | (282) | (99)
Reclassification from AOCI, tax expense (benefit) |  | (109) | (38)
Reclassification from AOCI, net of tax |  | (173) | (61)
Total securities available for sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (11,155) |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (2,840) |  |
Other comprehensive income (loss), before reclassifications, net of tax | (8,315) |  |
Reclassification from AOCI, pre-tax | 16 |  |
Reclassification from AOCI, tax expense (benefit) | 4 |  |
Reclassification from AOCI, net of tax | 12 |  |
Total other comprehensive income (loss), pre-tax | (11,139) | 9,172 | (11,404)
Total other comprehensive income (loss), tax expense (benefit) | (2,836) | 3,546 | (4,410)
Other comprehensive (loss) income, net of tax | (8,303) | 5,626 | (6,994)
Total derivative instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 490 | 874 | 856
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 125 | 338 | 329
Other comprehensive income (loss), before reclassifications, net of tax | 365 | 536 | 527
Total other comprehensive income (loss), pre-tax | 490 | 874 | 856
Total other comprehensive income (loss), tax expense (benefit) | 125 | 338 | 329
Other comprehensive (loss) income, net of tax | 365 | 536 | 527
Net gain arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 413 | 1,379 | 51
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 105 | 351 | 20
Other comprehensive income (loss), before reclassifications, net of tax | 308 | 1,028 | 31
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 328 | 407 | 480
Reclassification from AOCI, tax expense (benefit) | 83 | 158 | 178
Reclassification from AOCI, net of tax | 245 | 249 | 302
Reclassification of adjustment for net settlement gain realized in net income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | (383)
Reclassification from AOCI, tax expense (benefit) |  |  | (148)
Reclassification from AOCI, net of tax |  |  | (235)
Total defined benefit pension and post-retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | 741 | 1,786 | 148
Total other comprehensive income (loss), tax expense (benefit) | 188 | 509 | 50
Other comprehensive (loss) income, net of tax | $ 553 | $ 1,277 | $ 98

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